Index: src/wp-includes/general-template.php
===================================================================
--- src/wp-includes/general-template.php	(revision 32652)
+++ src/wp-includes/general-template.php	(working copy)
@@ -227,15 +227,17 @@
 				<label>
 					<span class="screen-reader-text">' . _x( 'Search for:', 'label' ) . '</span>
 					<input type="search" class="search-field" placeholder="' . esc_attr_x( 'Search &hellip;', 'placeholder' ) . '" value="' . get_search_query() . '" name="s" title="' . esc_attr_x( 'Search for:', 'label' ) . '" />
-				</label>
-				<input type="submit" class="search-submit" value="'. esc_attr_x( 'Search', 'submit button' ) .'" />
+				</label>'.
+                apply_filters( 'search_form_content', '' ) .
+				'<input type="submit" class="search-submit" value="'. esc_attr_x( 'Search', 'submit button' ) .'" />
 			</form>';
 		} else {
 			$form = '<form role="search" method="get" id="searchform" class="searchform" action="' . esc_url( home_url( '/' ) ) . '">
 				<div>
 					<label class="screen-reader-text" for="s">' . _x( 'Search for:', 'label' ) . '</label>
-					<input type="text" value="' . get_search_query() . '" name="s" id="s" />
-					<input type="submit" id="searchsubmit" value="'. esc_attr_x( 'Search', 'submit button' ) .'" />
+					<input type="text" value="' . get_search_query() . '" name="s" id="s" />' .
+                     apply_filters( 'search_form_content', '' ) .
+					'<input type="submit" id="searchsubmit" value="'. esc_attr_x( 'Search', 'submit button' ) .'" />
 				</div>
 			</form>';
 		}